Product Input Fields for WooCommerce <= 1.12.0 - Unauthenticated Limited File Upload

The Product Input Fields for WooCommerce plugin for WordPress is vulnerable to arbitrary file uploads due to insufficient file type validation in the add_product_input_fields_to_order_item_meta() function in all versions up to, and including, 1.12.0. This may make it possible for unauthenticated attackers to upload arbitrary files on the affected site's server which may make remote code execution possible. Please note that by default the plugin is only vulnerable to a double extension file upload attack, unless an administrators leaves the accepted file extensions field blank which can make .php file uploads possible. Please note 1.12.2 was mistakenly marked as patched while 1.12.1 was marked as vulnerable for a short period of time, this is not the case and 1.12.1 is fully patched.

Requests carrying this pattern arrive without a session, so nothing upstream of the firewall gets a chance to reject them: WordSec's web application firewall inspects request payloads before WordPress loads them. Classes like this one can leave something behind, so the staged malware scanner is the second half: it looks for dropped files and modified code rather than for the request that created them. None of that substitutes for the fix: Product Input Fields for WooCommerce 1.12.1 closes this, and updating the plugin is the step that ends it.

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